This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: It is possible to hear an approaching train before you can see it by listening to the sound wave ... (Read 148 times)

jho37

  • Hero Member
  • *****
  • Posts: 531
on: Jul 28, 2018
It is possible to hear an approaching train before you can see it by listening to the sound wave through the track. If the elastic modulus is 2.0  1011 N/m2 and the density of steel is 7.8  103 kg/m3, approximately how many times faster is the speed of sound in the track than in air? (vair  340 m/s.)
 a. 20
  b. 5
  c. 10
  d. 15
  e. 25

Question 2

The Young's modulus for aluminum is 7.02  1010 N/m2 . If the speed of sound in aluminum is measured to be 5.10 km/s, find its density (in kg/m3).
 a. 11.3  103
  b. 7.80  103
  c. 2.70  103
  d. 29.3  103
  e. 1.40  103


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

underwood14

  • Sr. Member
  • ****
  • Posts: 346
Reply #1 on: Jul 28, 2018
Answer to Question 1

d

Answer to Question 2

c


jho37

  • Member
  • Posts: 531
Reply 2 on: Jul 28, 2018
YES! Correct, THANKS for helping me on my review

mjenn52

  • Member
  • Posts: 351
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

Women are 50% to 75% more likely than men to experience an adverse drug reaction.

Did you know?

Fatal fungal infections may be able to resist newer antifungal drugs. Globally, fungal infections are often fatal due to the lack of access to multiple antifungals, which may be required to be utilized in combination. Single antifungals may not be enough to stop a fungal infection from causing the death of a patient.

Did you know?

In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

Did you know?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

Did you know?

The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

Listening to loud music with headphones or at rock concerts is a frequent cause of hearing loss amon Listening to loud music with headphones or at rock concerts is a frequent cause of hearing loss amon
Future train Future train
A passenger train crosses Stony Creek Bridge in the Rocky Mountains in 1878. Railroads were importan A passenger train crosses Stony Creek Bridge in the Rocky Mountains in 1878. Railroads were importan
Graphical representation of a sinusoidal longitudinal wave Graphical representation of a sinusoidal longitudinal wave
Human arrival and the extent of the recent extinction wave Human arrival and the extent of the recent extinction wave
Wave Basics Wave Basics
Video: Sex-Linked Traits! How are eye colors inherited in fruit flies?

For a complete list of videos, visit our video library